How to choose the seeds of Huangqi? What are the methods of raising seedlings?

Codonopsis lanceolata is a kind of ornamental red-leaf tree species, and it is also a good afforestation tree species. Some people will plant it specially for ornamental purposes, so how to choose its seeds on the market at present? What are the methods of raising seedlings? If you want to know more, please take a look at the following! The editor will tell you more about it.

First, how to select the seeds of Huangqi?

The selection of seeds is fastidious, generally we need to choose the seeds collected in the same year, and can be full, we can use air or water selection to remove blighted seeds in advance, so that we can leave full and high-quality seeds.

2. The method of raising seedlings of Codonopsis lanceolata seeds

1. Seed collection

Select the strong mother tree with early fruit and good quality, and harvest it in time when the fruit becomes yellowish brown from late June to early July, otherwise it is easy to blow off all the seeds in case of wind. After collecting, the seeds are dried, removed, screened, selected, dried and stored in a dry and cool place to prevent insect pests and rodents.

2. Seed treatment

The pericarp of Phellodendron chinense has a solid palisade cell layer, which hinders the infiltration of water, so the seeds must be treated before sowing. In general, in the first ten days of January, the seeds are selected by wind or water to remove the blighted seeds, then add clean water, rub the seeds with hands, wash off the adhesion on the seed coat, filter the water, replace the water and add an appropriate amount of potassium permanganate or carbendazim, soak for 3 days, remove the fine sand mixed with twice as much sand, mix and store it in the shade, so that it naturally freezes for low temperature treatment. In the process of accelerating germination, attention should be paid to often turning over and maintaining a certain humidity, so that the seeds can accept external conditions uniformly, germinate neatly, and prevent seeds from rotting at the same time. From late March to early April, the seeds swell by absorbing water and begin to sprout. After about 25-30% of the seeds are exposed, they can be sown.

3. Nursery site selection and site preparation

The loam with high topography, fertile soil, good water and fertilizer and good drainage was selected as the nursery ground. When the soil viscosity is high, it can be combined with soil preparation to add appropriate amount of fine sand or vermiculite to improve the soil. The suitable time for soil preparation is the first and middle of March. When preparing the soil, apply sufficient basic fertilizer, apply about 3000 tons of rotten organic fertilizer per 667m2, and apply 30 times 50 tons of compound fertilizer to pick up sundries.

4. Sowing seeds

The seedling of Phellodendron chinense is mainly raised in low bed. In order to facilitate daylighting, the bed is made from north to south, the width of the bed is 1.2m, depending on the topographic conditions, the bed surface is lower than the trail 10~15cm, and the suitable sowing time is from late March to early April. Disinfect the soil with formalin or carbendazim 3-4 days before sowing and fill with bottom water. After the water dries up, 33cm according to the row spacing, pull the wire to open the ditch, and spread the sand mixture sparsely, with a seed consumption of 6 / 7 / 667m2. After planting, cover the soil with about 1.5~2cm, gently press, flatten, and then cover with plastic film. At the same time, drainage ditches are opened around the seedbed to facilitate drainage in autumn. Be careful not to water the seeds before they germinate. Generally speaking, the seedlings come out 2-3 weeks after sowing.

5. Seedling stage management

(1) Irrigation and drainage

After the seedlings were unearthed, the reasonable irrigation amount and irrigation time were determined according to the water demand in different stages of seedling growth. Generally speaking, irrigation should be sufficient in the early stage of seedling growth, but irrigation should be strictly controlled within 20 days after the seedlings are unearthed, and under the condition that drought damage will not occur, irrigation should be reduced as far as possible, and the interval time depends on the weather conditions, generally watering once every 10-15 days; watering should be properly controlled in the later stage to facilitate squatting seedlings to survive the winter. In the autumn when Rain Water is more, attention should be paid to drainage to prevent stagnant water from causing root rot. (2) Intermediate seedling and fixed seedling

As the main stem of Phellodendron chinense seedlings is often tilted to one side, it should be planted closely. The seedlings are generally divided into 2 times: the first time, when the seedlings grow 2-3 true leaves. In the second time, the seedlings were carried out when the leaves overlap each other, leaving the good and getting rid of the poor growth, diseases and insect pests, mechanical damage and overdensity, at the same time keeping a certain distance between the seedlings, the plant distance should be 7-8cm. In addition, it can be combined with primary or secondary seedlings to supplement seedlings, preferably in cloudy days or in the evening.

6. Disease control

The common diseases and insect pests are aphids, blight, powdery mildew, mildew and so on.

(1) aphids: harm to leaves, tender stems, flower buds and terminal buds, causing leaves to wrinkle, curl, galls and fall off, and in serious cases lead to plant withering and death.

Control methods: old bark and damaged branches can be scraped off in early spring to eliminate overwintering eggs; when a large number of aphids occur, 40% omethoate, 50% malathion emulsion or 40% acephate 1000-1500 times can be sprayed every 15 days from May to August, and 1000-2000 times can also be sprayed.

(2) Rhizoctonia solanacearum blight: cause root or root neck cortex rot, and in serious cases cause wilting and death of diseased seedlings.

Prevention and control methods: clean the garden, deal with the diseased plants in time, spray 50% carbendazim 50% wettable powder 500-1000 times or spray 1 120 times Bordeaux solution, once every 10-15 days.

All right, that's all the editor is going to share with you today. If you have any ideas for planting cowpea, first of all, you have to choose high-quality seeds. Secondly, if you master certain seedling techniques, you can generally plant it well.

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